Instead of a new style disk with one style each of genre this could be something that covers playing styles (Strumming variations, Finger Picking, Grove patterns, etc. ) This could be very useful for song writers to add to other styles they are working on. I find I am always adding these type tracks to my BandInTheBox rendered tracks. This technique is used in almost all styles of music to fatten up and smooth the tracks. (The wall of Sound as the Beatles used it or the Nashville sound )